Not out of the evaporator drain. That drain is specifically for the evaporator due to the evaporator "sweating" and causes water to drip off of it and it needs to go somewhere. Same concept of a cold glass of water on a hot day and the outside of the cup starts to form water on the outside. Coolant would only drip from the heater core and if the heater core is dripping, its dripping directly onto the floor inside of your vehicle, not through the ac drain outside. I hope that clarifies it a little for you.
Thursday, June 25th, 2015 AT 7:35 PM